The cytosol or cytoplasm is the liquid found inside cells, and is composed with a complex mixture of substances dissolved in water. The cytosol stains are useful probes to monitor cell morphology and location for cell proliferation and viability studies. VitroVivo Biotech offers a selection of cell tracer dyes, which can freely diffuse through the membranes of live cells, and become membrane-impermeant after loading. Our cell tracer dyes exhibit ideal properties: stable and nontoxic at working concentrations, well retained in cells, and brightly fluorescent at physiological pH. Our cell tracer dyes have a wide range of emission spectra for multi-color imaging.